The Common Lore skill allows the character to recall general information, procedures, divisions, traditions, famed individuals, and superstitions of a particular world, group, organisation, or race. This skill differs from Scholastic Lore, which represents scholarly learning, and Forbidden Lore, which involves hidden or proscribed knowledge, in that it deals with basic information learned from prolonged exposure to a culture or area.

Success in a Common Lore Test indicates the character recalls general information about the subject. The GM determines what extra information to provide for additional Degrees of Success.

Adeptus Arbites: Knowledge of the various arms and sub-sects of the Adeptus Arbites, including such things as rank structure, common procedures, and the basic tenets of Imperial justice.

Adeptus Astartes: An understanding of the role, function, and nature of the famed Imperial Space Marines, as well as a knowledge of the commonly known Chapters and their practices and areas of operation.

Adeptus Mechanicus: A general understanding of the symbols and practices of the Adeptus Mechanicus as well as their hierarchy, identifiable ranks, and the existence of the Sixteen Universal Laws.

Administratum: Broad knowledge of the labyrinthine workings, rules, traditions, and dictates of the Adeptus Administratum.

Deathwatch: Knowledge of the function and organisation of the Deathwatch, including its primary mandates and favoured practices.

Ecclesiarchy: Understanding of the structure of the Adeptus Ministorum and its role in the worship of the God-Emperor as divine, its organisation, greetings, and general practices.

Imperial Creed: Knowledge of the rites and practices of the Imperial Cult, the most common observances, festivals, and holidays in honour of the Emperor, and the most well-known saints.

Imperial Guard: Basic information about the ranking system, logistics, structure, and basic tactical and strategic practices of the Imperial Guard, as well as particularly famed regiments.

Imperial Navy: Basic information about the ranks, customs, uniforms, and particular traditions of the Imperial Navy, as well as famous admirals and ships.

Imperium: Knowledge of the segmentums, sectors, and most well-known worlds of the Imperium.

Jericho Reach: Information concerning the general astrography of the Reach, including known worlds, recorded inhabitants, and theatres of conflict.

Tech: An understanding of simple litanies and rituals to soothe and appease machine spirits.

War: Knowledge of great battles, notable and notorious commanders, heroes, and famous stratagems employed by the Imperium in its many campaigns.